Assuming the island is going to have the necessary items for survival (trees, rocks near the beach, certain fruits and vegetables that grow on the island, wild animals for food and clothing) and that there is no electricity either, its an island, I'm assuming uninhibited by civilization, a lonely island in the middle of the ocean, so escape is possible, but too far away from any nearby civilization (escaping would be a risk unpredictable ocean storms, lack of food or water on the run in the ocean..... and so on) - that's how I imagine it.
I would take with me - even if they aren't too exciting.....
01 - my Watchog plush, my sole non-living companion
02 - my albino ferret, I'm sure if it can find food to survive, I should be able too as well
03 - a book on surviving to live in the wild (how to make water drinkable, how to b**graphic**r animals for food and clothing, how to make a fire - even if I know how, first aid without a first aid kit).
After a few days I would miss civilization and technology, I would miss a lot posting here on PokeCommunity.
I ♥ Foxes and Cats!! - art i drew myself
instead of 'Catch 'em All' for me would be "gotta Pet 'Em All"
check out my arts:
Jyo Espy - my discord name changes often, numbers: #0363